Rebound check



Oct. 21, 1930.

G. W. CRABTREE REBOUND CHECK 5 I 1926 4 Sheets$heeb 2 Filed Sept.

l/IIIII/IIIIIII/ 4 gwvwnto c G.W.CR AETREE P2 z 1 m M Oct. 2 l, 1930. G.w. CRABTREE 1,778,887

- REBOUND CHECK Filed Sept. 5, 1926 4 SheetS-Sheet' 3 6.W CRFIBTRBE Oct.21, 1930. (5. w CRABTREE REBOUND CHECK Filed Sept. 5, 1926 4Sheets-Sheet 4 G. W. CRHBTR ea L JM "may W Gite-um"- Patented Oct. 21,I930 i uMTEo TB GEORGE womammnor o Ev'ELAnn finrenrsonro I '3 nniaounnem Application filerl September My invention relates "to laminate-d leafsprings for vehicles, and in general myobject V V is to provide asupplemental attachment'for.

a leaf spring adapted to brake and retard'the I provide a supplemental"spring leaf ;5,"pref-" 55 I rebound or reflex action of the springwhile permitting perfect-freedom of movement or the spring in theopposite direction, all. as hereinafter shown and described and moreparticularly pointed m n the claims.

In the accompanying 'drawing,{Fig; 1 is a side elevation of one end of aleaf spring and a sectional view ofmy improve'd braking and retardingdevice 'attached thereto. 2 is a side view of-all the parts shown inFig; 1.

515 Fig. 3 isa vertical section transversely of'the' spring andattachment. Fig.4 is atopvieW These drag links extend downwardly beyondone of the secondary and shorter spring layof the coiled spring and itsrocking holder. Fig. 5 is a sectional view online-5 ,5 ofFig.

. 2. Figs. 6, 7 and 8, S heet 2, are views corresponding to 'Figsg'l,2'a'nd 3,;respectively, showing a modification ofthe invention, and Fig.9 is a top View thereof. Fig. 1 O,{S heet 3, is a front view ofavehicle'spring equipped with a modified formf of'the invention,'and

Figs. 11 and- 12 are sectional views, on. a

larger scale, of the working parts of the 'device. Fig. 13, Sheet4,-is'a perspective view of'another jmodified formi of lea-f springclamping device, and Fig. 1 1 isan' enlarged sectional view of apart' ofa "fullelliptic spring and said deviceaffixed thereto; 1

' The invention comprises a vehicle spring A having any desired numberoflaminations or leaves and constructed n gen,eral acc,ord-

with an eye 3'to permit it tobeconnected'to the frame or body of thevehicle by a link or shackle 4, and the spring may be a semi-elf lipticor quarter elliptic spring in that case. 7

However, the invention is also applicable to a full elliptic spring, andthemode of connection for the spring'with the axle and body laminatedleaf spring assemblydesigned to I ing to known practicesforconnejctionto a vehicle axle and body; F or: example, the longer leaf2 of.the spring.maybefformed" is secondary consideration, because inevery 3,1926. seria No. 133,311. 1

tween the spring leaves is utilized in thepresent' instance to obtain afriction clamping effect between the spring leaves inth'e iref 'boundorreflex action of the spring. Thus,

erably of lesser thickness than th'e'leaves of the main spring, whichsupplemental leaf 5 is laid upon or against longer leaf 2 and hasastraight reversed portion '6 terminatingin fa! I'roundjeye 7 adapted tobear against the 'top 6 0" or outer surface 86f said supplemental lea-f.

g bushing9, is confined withineye'7," and'a bolt 10 extends throughthis'bushing toipro- -vide a pivotal support and'fastfening' for, a 7

pair of drag'links 1l11 of jcrank'shapeat oppositesides or edges of thespring leaves. 7'

Iers or leaves to permit a second bolt ltto conv nect said linkstogether for joint movement 'fc and'to permit a braking or clamping shoe15 l prefer instead to 'interpose a, removable friction plate 17 betweenshoe 15.. and leaf 16,.and to provide one or moreshort'projections 18ion the shoe adapted to occupy corresponding openings orlshallowr'ejcesses 193180 in friction plate. 17 to prevent longitudinaldisplacement of the plate. TA spacing bushj ing20 for links 11is-sleeved 011-190113 1 1, and a "cylindrical member 21 is rotatablysleeved in an eccentrio positionupon this bushing 20 to permit brakeshoe 15v to be ustably fixed in respectjto spring leaf '16 and in tha tjwa'y permitting increased or decreased" friction and clampingpressuretobe obtainedagainst I '2 the, spring leaf and'permittingadjustments for'-wear. Eccentric memberf21 contains an annular groovewith worm teeth 21"whereby said, member maybe rotated and also locked bya screw-threaded bolt 22 whichjextends through openings in the lowerpart of shoe 15.. This shoe is also split or divided to permit eccentricmember 21 to be clamped between the divi'ded'sides when a tint onboltl'22 is tightened.- i

: The shorterarms 24 of the dragliinks rim;

9 7 v .v i ing dragiliiikslllandshoe'15 wlth 1t; But

crank members 11 extend toward the outer orreverted part ofsupplementary spring leaf 5, and a cross piece or saddle 25 having aseat 26 for a helical vspring 27's piv'otally connected with .orswiveled upon short arm 24 between the folds or within'the revertedpart; of spring leaf 5. As shown the cross a piece -25 is formed pf statment and comprises round trunnions 28-28 'pivotally sup-- ported withinarms 24, and springs'eat26 is p a its ertnt permitithe eoilsntheh: calspring 27 to be pressed downwardly when engaged at the center coil by aeesaw-'29- which extends; through a screwthreaded opening in the flatreverted part'fi oileaf springer Atter, adjustments and a desired sring-1 reasoning been obtained by means of set screw 19a ,loekinut "is:tightened to 1 assure a permanent setting oi setjscrew 29 ofHncaIpringefleiid constantly totilt drag links ,11 anther-common pivotbd1tf10, there- 'ibyiholdingffrition ine 17orl9rake sho 15 estnst the bt m c t e sn i sl V andneceentne member QIIniaybe adjusted'to V1'hold'thedrag-links I1 at substantially right {angles to l'the planesunse s or the leaf springs, I Z ,flnithisworking positioni of thepartssaddle125 carried by arms 24 of d ii gnlinksll .30."servesjt'olimit and stop the tiltingof said llinks in one direction, that is,toward the -stfepped ends of the spring leaves, thereby preventing shoeI5 Itroni'clamping the spring leavesltogether when the spring as' awhole ,35.i sffiexedfdownwardly. *In this downward ,rfiexurefof thespring the shorter bottom leaf ilG'c reepSrandlmoves' outwardly towardthe "shacklelconnection, and shoe 15 slides freely. THowever, helicallspring Q7 constantly bears Y go [down upon the saddle and thegcrankarms24 off 'draglinks ll'thereby actingjto tilt the c 'linksin the oppositedirection sothat shoe will alwiays be in'a friction-engaging posia r n,sperm-0a "when spin-1 Aig deflected downwardly underload, thel shorterleaves.

beneath niainiileaf 2 slide outwe-rdly, while jsupple nentalleaf 5 whichis above mainle'af '52 slidesin'the opposite "direction thus carry-,inithisi movement shoe" 15 is prevented from I ilampingithe leavestogether the stop rela- Etians established forthe' draglinks atsaddle,55 '25. "Shoe 15 ;hasa tendency to travel out- "wardly with spring leaf16 but helical spring '27 count racts t'his tendency, The vehicle springiszthereforefree to flex downwardly without hindrance or check. However,the

re oil movement o'f'the spring is immediately retarded-or checked by aclampingaction of shoe l5 which functions'then as follows As the reflexaction'ofthe main spring takes place the short bottom leaves thereof'slide I ,135 ,in antever serdirection, that is, away from;in-

"inpressingldown uponthe crank arms of the links;;fosters,:1and;'expe;dites the clutching acthe bindingactionon the slidingleaves of results and it'also preventsloos'eness orrar-A as 6ofsupplementa'l leafbi f to connect;with a cross 'bolt' 46 fifor a pairof stead of toward the shackle connection, while, the reverted end ofsupplemental spring 5 moves toward said connection, thus dragging links11 andthe shoe with the end of said supplemental spring and therebytilting the c 1 links and effectlng a clutching actlon of the shoeagainst leaf 16 andclamping the several i leaveainclud ng supplementalleaf 5, be-

tween the ghee and eye 7. Helical spring 27 tion of shoe}15, and suddenor violent relhoun'diof the main spring is prevented, not

tling. A flat helicalspring seatedwithin shallow cup-shaped cross piece:or'saddlefalso permits a eompact assembly; of parts, andconfinementthereof between th-e revertedifdldsfof spring '5 with amplefroointor tree. 'm-o've'ment so of such parts whe'n soconfinedanclgotect e. However, the inode ofconnect on oi the drag links withtliefsupplement'al spring is suscep tible to modification withoutdeparting materially from the actual lnventloninvolved, and.

therefore T do not wish tofliinit' myselt to oh 7 'vious mechanicalchanges: or modifications in f thati connectionflor 'other; ream-seashown herein, For example, thecla'm'ping shoe in the present case isshown seated againstthe sjecond'short lea'fof theilafninated vehicle aspring; but, obviously this shoednay be onf 'gaged' with one of theother short leaves or one m r eavesetheredf.

3 Figs. 6 to 9, illustrateamodifledforniof thems 1nvent10n,comprislngidra'g l nks 11 havln g crank arms, 81 extend ng away from"the spring shackle Lanid engaged by a fiat' spring 32' which rests atits middleluponj eye7 and feXt-ends under aiconnecting piece 33 between,,110

crank arms 31. The opposite je'n'd of spring" 321is1heldunder adjustablespring tension by a screw 34 "which passes through a flanged o collartrashing 35 within thereverteclfpor- Figs-101m 12'il1lis are a other modfies-f I'ftion, comprising"cranlr-shapeddra'g. 1inksf36carrying'a"brakeshOeSY antl'a'n eccent ric'i i,

thesupplemental spring leaf 39in thisca'se having 'ar'everted portionor. eye 40 whichiis pivotally connected to'a bolt 41 betweencrank armsTheend'ipartof leaf 39 is bowed or bent apart from main leai '2of'thevehi'cle spring sothatit tendsto tiltf the draglinlrs constantlyin one direction and hold brake shoe? againstasecondaryleaf5 v Figs.13and 14* how till another forin of .the 'inventiom; comprising; asupplemental leaf 4st having an'eye 45 a't each'endadapted drag links 47having a brake shoe 48 engaged with a secondary leaf ofthe vehiclespring. An eccentric 49 is mounted between the crank'arms 50,.and abowed spring 51 is curled at one end around this eccentric and of thesecondary leaves of the v laminated spring, said shoe being adapted toclamp and bind the spring leaves under recoil movements of thevehic'lespring, and compound lever and spring means co-acting with said draglinks and adapted to limit the movement of said shoe in one direction topermit free sliding movement of the shoe upon flexure of the vehiclespring under load. v

2. A rebound check for laminated vehicle springs, comprising asupplemental leaf member, drag links .pivotally'connected to said leafmember, aclamping shoe connected 4 to said links, means for adjustinsaid shoe 'to obtain different clamping'e ect-stherewith, and compoundleveran'd spring means associated with and adapted to tilt said links.

3. A rebound check for laminated vehicle springs, comprising a suplemental leaf, links pivotally connected 0 said leaf, a clamping shoeconnected to said links, and an eccentric device for adjusting saidshoe.

' hicle spring.

4. A rebound check for laminated vehicle springs, comprising asupplemental leaf, links pivotally connected :to "said leaf, aclamping'shoe carried by said links, adjust able'means for fixing theworking position of the'shoe, andadjustable springs for tilting saidlinks to keep said shoe in contact with one of the leaves of thelaminated .ve-

5. A rebound check for laminated vehicle springs, comprising drag links,a rotatable eccentric supported upon said links, ajsplit mounted uponsaid reverted end having peripheral teeth, a divided clamping Y shoesleeved rotatably upon saidec'centric,"

peripheral teeth, and a, nut for is aid bolt adapted to clamp thel'splitshoe upon the eccentric.

nected to said'member, a cross piece 'connected to said drag links, anda coiled-spring seated upon said cross piece opposite said revertedportion.

9. A rebound check for "laminated vehicle a screw-threaded boltextending through said divided shoe in screw-engagement with said 8. A'rebound check for laminated vehicle springs, comprising a supplementalmember having a reverted end portion, va clamping shoev and drag-linkstherefor pivotally consprings, comprising a supplemental leaf havingareverted end portion, drag links";

pivotally connected to said reverted, endf portion, a clamping shoesupported by said links,'a spring seat supporte'dfuponsaid linksopposite said reverted end portionpa coiled spring resting uponsaidseat, and. an

. adjusting screw mounted upon said reverted 'portlon and engagingsaidcoiled sprin '10. A rebound check for laminate .ve-

for said shoe pivotally connected with said connection between saidcrankarms adapted" to engage said reverted portion, and limit the tiltingmovement of said draglinks in one direction, a helical spring seatedupon said cross connection, and an ad ustmg-sCreW engaging said spring.

memberjhaving a reverted end-portion,za

'hicle springs,' comprising' a supplemental leaf having a reverted endportion terminatp 2 111g in vaneye, a clamping shoe, drag links,

eye, said links having crank arms, a cross loo portion and c ll fA,rebound check for laminated lve-fi 'hicle' springs, comprising asupplemental 5:

clamping shoe and drag-links therefor pivotally connected-to saidmember, a cross 1 piece connected to said drag links, and a springbearing against said cross piece opposite said reverted portion.

Intestimony whereofI afiix my si nature. f'

GEORGE W B EE.

clamping shoe sleeved upon said eccentric,

I and means adapted to clamp-said split shoe upon said eccentric. 55'

springs, comprising a pair of drag links, an; eccentric rotatablysupported betweensaid,

6. A reboundcheck for laminated vehicle links having .worm teeth, 'aclamping shoe sleeved upon said eccentric, and a rotatable screw uponsald shoe in screw engagement I With said worm teeth. 3

7. A rebound check for laminated vehiclesprings, comprising a pair ofdrag links, a,

bolt connecting said links, an eccentric rotatably mountedupon saidbolt, said eccentric

